Hard-material threaded connection

Abstract

A hard-material threaded connection includes a structural part, which has a hard material and a first threaded portion formed in the hard material, and a component having higher elasticity that has a second threaded portion cooperating with the first threaded portion. The first threaded portion and the second threaded portion have a different thread pitch.

The invention claimed is: 
     
       1. A hard-material threaded connection, comprising:
 a structural part having a hard material selected from the group consisting of a cemented carbide, a cermet and a cutting ceramic and having a first threaded portion formed in said hard material; and 
 a component having higher elasticity than said hard material and having a second threaded portion cooperating with said first threaded portion, said first threaded portion and said second threaded portion having different thread pitches, wherein a difference in said thread pitches amount to more than more than 1.5%. 
 
     
     
       2. The hard-material threaded connection according to  claim 1 , wherein a difference in said thread pitches amounts to between 2.1% and 8%. 
     
     
       3. The hard-material threaded connection according to  claim 1 , wherein said first threaded portion is an internal thread. 
     
     
       4. The hard-material threaded connection according to  claim 1 , wherein said first and second threaded portions define an internal threaded portion and an external threaded portion, said internal threaded portion has a higher pitch than said external threaded portion. 
     
     
       5. The hard-material threaded connection according to  claim 1 , wherein said first threaded portion is configured as an internal thread and is provided with a countersink such that said internal thread is applied so as to be recessed with respect to a surface of said structural part. 
     
     
       6. The hard-material threaded connection according to  claim 1 , wherein said structural part which has said hard material is an exchangeable cutter. 
     
     
       7. The hard-material threaded connection according to  claim 1 , wherein said hard material is a hard metal or a cermet. 
     
     
       8. The hard-material threaded connection according to  claim 1 , wherein a difference in said thread pitches amounts to more than 2%.